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<html>
<head>
  <meta charset="UTF-8">
  <title>iron-list test</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">

  <script src="../../webcomponentsjs/webcomponents-lite.js"></script>

  <script src="../../web-component-tester/browser.js"></script>
  <script src="../../test-fixture/test-fixture-mocha.js"></script>

  <link rel="import" href="fixtures/helpers.html">
  <link rel="import" href="fixtures/x-list.html">

</head>
<body>

  <test-fixture id="trivialList">
    <template>
      <x-list list-height="200" item-height="4"></x-list>
    </template>
  </test-fixture>

  <test-fixture id="trivialListSmall">
    <template>
      <x-list list-height="4" item-height="4"></x-list>
    </template>
  </test-fixture>

  <script>
    'use strict';
    suite('dynamic physical count', function() {
      var list, container;

      setup(function() {
        container = fixture('trivialList');
        list = container.list;
        list.items = buildDataSet(200);
      });

      test('increase pool size', function() {
        PolymerFlush();
        list.scrollTop = 0;
        var lastItem = getLastItemFromList(list);
        var lastItemHeight = lastItem.offsetHeight;
        var expectedFinalItem = container.listHeight/lastItemHeight - 1;

        assert.equal(list.offsetHeight, container.listHeight);
        assert.equal(lastItemHeight, 4);
        assert.isTrue(isFullOfItems(list));
        assert.equal(lastItem.textContent, expectedFinalItem);
      });
    });

    suite('iron-resize', function() {
      var list, container;

      setup(function() {
        container = fixture('trivialList');
        list = container.list;
        list.style.display = 'none';
        list.items = buildDataSet(200);
      });

      test('increase pool size after resizing the list', function(done) {
        flush(function() {
          list.style.display = '';
          assert.notEqual(getFirstItemFromList(list).textContent, '0', 'Item should not be rendered');
          list.fire('iron-resize');
          PolymerFlush();
          assert.equal(getFirstItemFromList(list).textContent, '0', 'Item should be rendered');
          done();
        });
      });

      test('pool should not increase if the list has no size', function(done) {
        flush(function() {
          container.style.display = 'none';
          list.fire('iron-resize');
          PolymerFlush();
          assert.equal(list._physicalCount, 0);
          done();
        });
      });

      test('last visible items should change on resize', function(done) {
        flush(function() {
          list.style.display = '';
          list.fire('iron-resize');
          PolymerFlush();
          assert.equal(list.lastVisibleIndex, 49, 'The 50th item should be visible.');
          container.listHeight = 300;
          requestAnimationFrame(function() {
            list.fire('iron-resize');
            PolymerFlush();
            assert.equal(list.lastVisibleIndex, 74, 'The last visible changed as expected.')
            done();
          });
        });
      });

      test('first visible items should change on resize when scrolled to the end of the list', function(done) {
        flush(function() {
          list.style.display = '';
          list.fire('iron-resize');
          list.scrollToIndex(199);
          PolymerFlush();
          assert.equal(list.lastVisibleIndex, 199, 'Scroll is maxed out.');
          assert.equal(list.firstVisibleIndex, 150, 'The first visible index is appropriately set.');
          container.listHeight = 300;
          list.fire('iron-resize');
          flush(function() {
            assert.equal(list.lastVisibleIndex, 199, 'Scroll is maxed out.');
            assert.equal(list.firstVisibleIndex, 125, 'The first visible item changed as expected.')
            done();
          });
        });
      });
    });

  </script>

</body>
</html>
